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1.6—0.5x=2.7x+0.16

(1)x²-34x+288=0 (x-16)(x-18)=0 x=16 或 x=18 (2)0.5x²-0.1x+2.7=0 解:由判别式△=b²-4ac=(-0.1)²-4x0.5x2.7=-5.39

=(1.5+4.8÷1.6x0.1)x2.7 =(1.5+3x0.1)x2.7 =1.8x2.7

(1)0.16÷(x?12425)=1720÷2.7, 0.16÷(x?12425)×12425x=12×12425x, 0.16=0.98x, 0.16÷0.98=0.98x÷0.98, x=849;(2)12:20%=214:(x+0.3),12×(x+0.3)=20%×214, 12x+320=920, 12x+320?320=920?320, 12x÷12=310÷12, x=35.

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